Imagine that you’re writing an essay for your history class on social unrest in america during the 1960s. you might expect all of the following sources to provide excellent evidence to support your thesis that social unrest in america was pervasive during the 1960s except:

a. newspaper articles and photographs from the mid-1960s chronicling the large number of student-led protests on college campuses in america

b. a book of protest and folk songs published in 1970 that provides a topical overview of events that transpired during the 1960s

c. federal census records from 1960 and 1970 that give population figures for states west of the mississippi river

d. intelligence reports collected by the federal government during the 1960s that document regional protest movements